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Debt - Debt Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Long-term debt maturities    
Remainder of 2017 $ 6,250  
2018 25,000  
2019 25,000  
2020 25,000  
2021 25,000  
2022 143,750  
Thereafter 433,484  
Total long-term debt $ 683,484 $ 728,173